- Definitions|1
- Thesaurus|231
- Abbreviations|0
| immovability(firmness, rigidity, stiffness) | |
| impenetrability(noun, cruelty) | |
| impenitence | |
| impersonality(noun, coldness, unfriendliness, taciturnity) | |
| implacability(ruthlessness, pitilessness, mercilessness) | |
| implacableness(ruthlessness, pitilessness, mercilessness) | |
| impudence | |
| incompliance(ruthlessness, pitilessness, mercilessness) | |
| incompliancy(ruthlessness, pitilessness, mercilessness) | |
| indomitability(ruthlessness, pitilessness, mercilessness) | |
| inelasticity(inflexibility, stiffness) | |
| inexorability(ruthlessness, pitilessness, mercilessness) | |
| inexorableness(ruthlessness, pitilessness, mercilessness) | |
| inflexibility(firmness, severity, strictness, rigidity, stiffness) | |
| inflexibleness(ruthlessness, pitilessness, mercilessness) | |
| insensibility(noun, torture, cruelty, harshness, malice) | |
| intransigence(ruthlessness, pitilessness, mercilessness) | |
| intransigency(ruthlessness, pitilessness, mercilessness) | |
| malice(noun, torture, cruelty, harshness, unkindness) | |
| maliciousness(noun, cruelty, coldness, callousness, pitilessness) |
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| APA | Smart Define. (2015). hardheartedness thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/hardheartedness/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hardheartedness thesaurus" https://smartdefine.org/hardheartedness/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, hardheartedness thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/hardheartedness/thesaurus/synonyms>. |
| MLA | Smart Define. "hardheartedness thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/hardheartedness/thesaurus/synonyms> |